Fuel injection apparatus



July 7, 1959 c. H. NYSTROM 2,893,366

FUEL INJECTION APPARATUS Filed Oct. 31. 1955 INVENTOR. CA'EL H. NYSTEOI"! United States Patent FUEL INJECTION APPARATUS Carl H. Nystrom, West Springfield, Mass, assignor to American Bosch Arma Corporation, a corporation of New York Application October 31, 1955, Serial No. 543,943

7' Claims. (Cl. 123-140) This invention relates to fuel injection apparatus and more particularly tosuch apparatus for spark ignition type internal combustion engines and has particular reference to the provision of means for controlling the quantity of fuel delivered so that upon deceleration of the engine, the quantity of fuel delivered to the engine is less than idle fuel quantity.

An object of the invention is to provide new and improved fuel injection apparatus embodying means for automatically reducing the quantity of fuel delivered to the engine upon deceleration of the engine.

Another object is to provide a device of the type set forth which is relatively simple and inexpensive in con struction and efficient in operation.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts without departing from the scope of the invention as set forth in the accompanying claims, as the preferred form has been given by way of illustration only.

Referring to the drawing, the drawing is a side view partially in section of the apparatus embodying the. invention.

In engines, an air throttle valve is positioned in the entrance to the manifold and controls the entrance of air into the manifold thereby increasing and decreasing the engine speed. Rapid closing of the throttle valve, when the engine is running at a relatively high speed, results in. abnormally high vacuum in the manifold beneath the throttle valve. This. high vacuum is employed in the. present invention to effect a cutting off of the fuel during this deceleration period.

Referring more particularly to the drawing, the apparatus shown comprises the fuel injection pump 10 of any desired type, for example,.that shown in application Serial No. 503,072 filed April 22, 1955, by Nystron, et al now Patent 2,828,728 issued April 1, 1958.

This pump 10 has theoutlets 11, one of which is adapted to e connected to each of the combustion chambers for supplying fuel thereto. The pump is also provided with the operating lever 12 for controlling the quantity of fuel delivered by the pump, which quantity is automatically controlled by the control 13 which comprises a cylinder 14, in which is positioned the piston 15, which is operatively connected to the lever 12 by the link 16.

The control is provided with the springs 17 and 18 with the spring 17 engaging the inner surface of piston 15 at one end and its opposite end engaging a stop 19. Spring 18, which is within spring 17, is shorter than spring 17 and, therefore, adapted to operate only after movement of piston 15 a suflicient distance for spring 18 to engage stop 19 and the spring seat or the inner side of the piston.

Cylinder 14 is connected by the line 20 to a source of modulated engine vacuum whereupon, changes in said vacuum upon movement of the throttle, varies the posi- 2,893,366 Patented July 7, 1959 tion of piston 15 against the force of springs 17 and 18 to thereby vary the fuel quantity delivered by the pump 10.

This source of modulated engine vacuum may be provided as set forth in application Serial No. 539,987, filed October 12, 1955, or may be provided by connecting a line 20a from atmospheric pressure to line 20 with a valve 2% in said line 20a whereby an atmospheric pressure bleed into line 20 is provided.

The stop member 19 also comprises a piston in a portion of the cylinder 14, or this might be a separate Cylinder, beyond the connection of line 20 to cylinder 14 and the stop 21 such as a snap ring, is provided for limiting the movement of piston 19.

Cylinder 14 is connected beyond piston 19 to a source of engine manifold vacuum by line 22 and the movement of piston 19 by this vacuum is opposed by spring 23.

The modulated engine vacuum is always a little lower than the true engine vacuum.

During the cranking of the engine, a very low vacuum is provided and, therefore, the springs 17 and 18 move the piston 15 to the position shown in the drawing whereby the pump control lever 12 is in position to provide a rich mixture for starting the engine. The operating or control lever 12 is shown in full load position.

When the engine starts, the modulated engine vacuum increases depending on starting conditions and the true engine vacuum through line 2 is higher than the modulated engine vacuum in line 20, however, the force of spring 23 is sufficient to counteract the true engine vac? uum in line 22.

Under normal operating conditions, upon deceleration of the engine, the true engine vacuum increases considerably while the modulated engine vacuum stays approximately the same and because of this increase in the true engine vacuum, this vacuum is sufficient to overcome the force of spring 23 thereby releasing the force of piston 19 against springs 17 and 18 and allows movement of piston 15, link 16 and operating lever 12 to lower than idle or normal lean running position and according to the setting of the pump control, moves the pump control to lower than idle position or to fuel cutoff position, as desired.

It will thus be seen that when the engine slows down so that when the car is running at the lowest speed, the vacuum in the manifold returns to the normal idle mixture vacuum and piston 19 is returned to normal running position and returns the spring to normal running position which in turn positions piston 15 and the pump control to normal running position.

It will be seen from the foregoing that upon deceleration of the engine, the pump control can be moved to less than idle or to cutoff position, as desired.

From the foregoing it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the engine.

I claim:

1. In a device for controlling the fuel pump for reducing the quantity of fuel supplied an internal combustion engine during deceleration thereof, said device being adapted to be operatively connected to the pump control and comprising, pressure operated means operatively connected to said control for setting said control to provide correct air/fuel ratio, said pressure operated means being adapted to actuate said control according to manifold pressure modified by an atmospheric bleed, resilient stop means and auxiliary pressure means operatively connected to manifold pressure or vacuum and actuated thereby for adjusting said stop means for allowing said control to move to a position outside its normal operating range during deceleration of the engine to thereby reduce the quantity of fuel supplied to the engine.

2. In a device for controlling the fuel pump for reducing the quantity of fuel supplied an internal combustion engine during "deceleration thereof, said device being adapted to be operatively connected to the pump control and comprising, a memberhaving a chamber, two spaced manifold pressure operated members in said chamber, one of said members being connected tosaid control, the other of said members being a stop for said member connected to said control during normal operation of the engine, said chamber between said pressure operated members being connected to engine manifold pressure or vacuum modified by an atmospheric bleed and said chamber behind the pressure operated member remote from said control being connected directly to engine manifold pressure or vacuum, whereby upon deceleration resulting from rapid closing of the engine throttle, the high vacuum created in the engine manifold will effect movement of said member remote from said control to reduce the quantity of fuel supplied to the engine.

3. In a device for controlling the fuel pump for reducing the quantity of fuel supplied an internal combustion engine during deceleration thereof, said device being adapted to be operatively connected to the pump control and'comprising, a chamber, two spaced manifold pressure operated members in said chamber, one of said members being connected to said pump control, said chamber between said pressure operated members being connected to engine manifold pressure or vacuum modified by an atmospheric bleed, said pressure operated member not connected to said control acting as an adjustable stop for the'pressure operated member connected to said control to limit the movement of said member, said pressure operated member not connected to said control being adjusted by manifold pressure or vacuum under deceleration conditions whereby said member connected to said control may move to a position outside its normal operating range during deceleration of the engine to thereby reduce the quantity of fuel supplied to the engine.

4. In a device for controlling the fuel pump for reducing the quantity of fuel supplied an internal combustion engine during deceleration thereof, said device being adapted to be operatively connected to the pump control and comprising, a member having a chamber, two spaced manifold pressure operated members in said chamber, one of said members being connected to said control, means connecting said chamber between said pressure operated members to engine manifold pressure or vacuum modified by an atmospheric bleed and means connecting said chamber behind the pressure operated member remote from said control directly to engine manifold pressure or vacuum and resilient means between said pressure operated members, whereby upon deceleration resulting from rapid closing of the engine throttle, the high vacuum created in the engine manifold will effect movement of said member remote from said control to reduce the quantity of fuel supplied to the engine.

In a; device for controlling the fuel pump for reducing the quantity of fuel supplied an internal combustion engine during deceleration thereof, said device being adapted to be operatively connected to the pump control and comprising, a chamber, wo spaced manifold pressure operated members in said chamber, one of said members being connected to said control, means connecting said chamber between said pressure operated members to engine manifold pressure or vacuum modified by an atmospheric bleed, said pressure operated member not connected to said control acting as an adjustable stop for the pressure operated member connected to said control to limit the movement of said member, said pressure operated member not connected to said control being adjusted by manifold pressure or vacuum under deceleration conditions whereby said member connected to said control may move to a position outside its normal operating range during deceleration of the engine to thereby reduce the quantity of fuel supplied to the engine and resilient means between said pressure operated members.

6. In a device for controlling the fuel pump for reducing the quantity of fuel supplied an internal combustion engine during deceleration thereof, said device being adapted to be operatively connected to the pump control and comprising, a member having a chamber, two spaced manifold pressure operated members in said chamber,

one of said members being connected to said control,

means connecting saidchamber between said pressure operated members to engine manifold pressure or vacuum modified by an atmospheric bleed and means connecting said chamber behind the pressureoperated member remote from said control directly to engine manifold pressure or vacuum and a pair of resilient means of different lengths between said pressure operated members, whereby upon deceleration resulting from rapid closing of the engine throttle, the high vacuum created in the engine manifold will effect movement of said member remote from said control to reduce the quantity of fuel supplied to the engine.

7. In a device for controlling the fuel pump for reducing the quantity of fuel supplied an internal combustion engine during deceleration thereof, said device being adapted to be operatively connected to the pump control and comprising, a chamber, two spaced manifold pressure operated members in said chamber, one of said members being connected to said control, means connecting said chamber between said pressure operated members to engine manifold pressure or vacuum modified by an atmospheric bleed, said pressure'op'erated member not connected to said control acting as an adjustable stop for the pressure operated member connected to said control to limit the movement of said member, said pressure operated member not connected to said control being adjusted by manifold pressure or vacuum under deceleration conditions whereby said member connected to said control may move to a position outside its normal operating range during deceleration of the engine to thereby reduce the quantity of fuel supplied to the engine and a pair of resilient means between said pressure operated members.

References Cited in the file'of this patent UNITED STATES PATENTS 2,708,919 Wellington et al. May 24, 1955 

